The Power Miners have been battling the Rock Monsters for some time now, and have just recently created a prison for these dastardly beings: Lavatras! Join the Miners as they avoid destroying the unruly beasts by sending them to the high-tech Lavatras facility. Complete with heavy-duty fencing and a claw for placing monsters inside, this set is great for fans of the hit LEGO Power Miners line of sets!